Yasm working with Win32

[Simon Marlow]

Peter Tanski wrote:
> On Dec 14, 2006, at 6:19 AM, Simon Marlow wrote:
> 
>> Peter Tanski wrote:
>>
>>> I tracked down the cause of the problem with the .comment section.
>>> It was not caused by Yasm and will not cause a problem with the MS
>>> tools.
>>
>>
>> This all looks good, thanks for investigating Peter.  The Windows  
>> native port gets a step closer!
> 
> 
> The latest build of Yasm, yasm-r1712 is patched and works fine with  
> ghc.  For the record, here is the download link:
> http://cvs.tortall.net/projects/yasm/snapshots/r1712/  (use yasm- 
> r1712-dos ; yasm-r1712 crashes--looking into it.)
> 
> As part of testing Yasm, I looked at the next step for the Windows  
> native port: building and testing GHC using Yasm as the assembler,  
> which may benefit from changing the option flags in compiler/main/ 
> DriverPipeline.hs and compiler/main/DynFlags.hs .  I would like to  
> change the flags to:
> (1) move the hard-coded option parameters for 'runPhase As ...' in  
> DriverPipeline.hs into separate option sets in DynFlags.hs --that way  
> you only have to look in one place to change the hard-coded options  
> (or, in this case, to code them conditionally under a preprocessor  
> define USE_YASM);
> (2) include parameters for Yasm ("-ax86", "-pgas", "-fwin32"); and,
> (3) include Yasm as a configuration option (--enable-yasm).
> An alternative implementation would be to add a special command line  
> option, --yasm, to enable use of yasm, although this would require  
> Makefile changes both for building and testing, in the same way as  
> using --pgma, --opta ... to use Yasm as is.  What do you think?

For the native Windows port, we should have a new target, probably 
i386-unknown-win32 or i386-unknown-windows.  Then we can have an option in 
config.mk to control whether YASM is used, $(UseYASM), which would be on by 
default for windows_TARGET_OS.  Later we might want to make it a configure 
option, but for now I'd leave it as a build.mk option.

Cheers,
	Simon